What causes the seasons on Earth?
AThe tilt of the Earth's axis
BThe changing distance to the Sun
CThe speed of the Earth's spin
DThe size of the Earth's orbit
Answer & Solution
Correct answer: A. The tilt of the Earth's axis
1. The axis of the Earth is tilted and always points the same way in space.
2. As the Earth travels around the Sun, first one half then the other leans towards it.
3. The half leaning towards the Sun receives more direct sunlight and has summer.
4. The distance between the Earth and the Sun changes far too little to explain this.
_Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Why do we have seasons?_